My son, his cousin and I observed a blue-silver disk shaped object about 500 feet in altitude and less than 1 mile off the Interstate .

My son and his cousin were driving west on Interstate 15, a few miles west of American Falls, Idaho and about 5:00 pm on Friday July 7, 2000. I noticed a disk shaped object to my right, about 1/2 mile north of the Interstate and maybe 500 feet in altitude. My son and his cousin also saw the object. It's color was blue-silver and wobbled slightly. The sun reflected off its surface several times. I asked my son to hand me my binoculars while I pulled the vehicle over to the side of the Interstate. I was thinking at the time that the UFO would probably disappear before I had a chance to view it. As I pulled over and took the binoculars and as I scanned the sky the object was gone. Neither I, nor my son and his cousin could locate the disk. We saw it for less than 60 seconds. THe disk shaped object had no wings and appeared metalic and smooth with no windows or doors. The sky was clear, no clouds. It left no trail, no lights, no apparent sound. A few minutes later we did observe a small private plane eastbound and south of the interstate. I teach high school, my son and his cousin are currently in 8th grade. I am an amatuer astronomer and was heading to a local campground for a sky show that evening.